Acute whole-body vibration does not affect static jump performance     

《European Journal of Sport Science》2013,13(1):19-25

Abstract

Currently, whole-body vibration is being used to promote enhanced performance. Many coaches and athletes believe that it can acutely enhance explosive performance and power output. However, the scientific literature is unclear as to whether this enhancement occurs. The purpose of this study was to examine the acute effects of whole-body vibration on static jump performance, including jump height, peak force, rate of force development, and peak power. Fourteen recreationally active individuals (5 females, 9 males) participated in three separate randomized treatment sessions. Treatment 1 consisted of no vibration while treatment 2 and treatment 3 incorporated whole-body vibration. The whole-body vibration protocol consisted of three 30-s bouts of vibration performed at 30 Hz and low amplitude (~3 mm) with a 30-s rest between bouts. Treatment 1 was identical in duration to both treatments 2 and 3, but did not contain any vibration. Five minutes after each treatment, the participants performed the static jump protocols. Two (data averaged) non-weighted static jumps and two 20 kg weighted jumps were performed. Treatments 1 vs. 2, 1 vs. 3, and 2 vs. 3 were calculated for each variable at both 0 kg and 20 kg. Jump height, peak force, rate of force development, and peak power were analysed using a one-way analysis of variance with repeated measures. The intra-class correlations comparing the two trials of each jump for each of the three treatments were ≥0.92. Compared with the no-vibration condition, jump height showed a non-significant increase as a result of whole-body vibration for both unweighted and weighted jumps; peak force, rate of force development, and peak power were not statistically different. The results indicate that whole-body vibration has no effect on jump height, peak force, rate of force development or peak power during static jumping.  相似文献   

NBA与CBA比赛跳跃步法的对比分析          下载免费PDF全文

姚远  阮棉芳  任峰 《体育科研》2012,33(4):73-76

通过录像分析了NBA与CBA各8场比赛,对比CBA与NBA比赛中各个位置队员使用各种跳跃步法的差异。将跳跃步法按原地起跳、一步助跑起跳、两步以上单脚起跳、两步以上双脚起跳、后撤步起跳、连续起跳、横向移动急停起跳等7种方式进行了归类和统计。结果发现CBA队员比NBA队员更多地采用了原地起跳,而在一步助跑起跳与两步以上助跑双脚起跳的使用频率上比NBA低。相差最大的是横向移动急停起跳,NBA的控球后卫、得分后卫、小前锋使用该步法的频率分别是CBA相同队员的1.6倍、2.1倍、3.9倍。提示：CBA队员应该增加运动中起跳的次数,尤其要加强对横向移动急停起跳的训练与应用。同时要加强对横向移动急停起跳的生物力学研究,为提高训练效果、预防损伤、研发符合篮球运动特点的篮球鞋提供理论依据。  相似文献   

对《田径竞赛规则》中有关抢跑规则的再研究     

郭立亚 《中国体育科技》2002,38(7):34-35

通过调查分析 ,对现行《田径竞赛规则》中有关抢跑的规则提出了疑义 ,并提出了在国内中、小型比赛中第 1次抢跑犯规以后 ,无论哪个运动员再抢跑犯规 (不论该运动员是第几次犯规 )均应取消比赛资格和在国际比赛、国内大型比赛中使用一次性起跑规则的建议  相似文献   

Aerodynamic force data for a V-style ski jumping flight     

K.?SeoEmail author  I.?Watanabe  M.?Murakami 《Sports Engineering》2004,7(1):31-39

To determine the flight of a ski jumper it is essential to know what aerodynamic forces are acting on the ski jumper. However, few data on this are available, especially for a V-style ski jumping flight. We have measured the aerodynamic forces during the free flight phase for a V-style, as well as a parallel-style, ski jump by employing a full-size model in a wind tunnel. The aerodynamic force data, (drag, lift and pitching moment) were obtained to create an aerodynamic database. These forces are given in polynomial form as functions of the angle of attack, the body-ski (forward leaning) angle and the ski-opening (V-style) angle. Using the polynomial form database is a convenient way of obtaining the aerodynamic forces. Moreover, the wind tunnel was equipped with a ground effect plate to measure the aerodynamic forces during the landing phase. It was found that the difference between the lift with and without the ground effect plate increases with the ski-opening angle. The longitudinal stability in the pitching motion of a body-ski combination is also discussed on the basis of the pitching moment data. This indicates that a stable pitching oscillation of the body-ski combination may arise around an equilibrium point in the angle of attack, the trim angle of attack, during flight.  相似文献   

从"李小鹏跳"看世界跳马比赛的创新与发展   总被引：8，自引：0，他引：8  

黄亮明 《广州体育学院学报》2004,24(1):82-85

从体操新规则实施前后跳马动作的对比,研究了“李小鹏跳”的发展与创新历程。结果表明：世界男子跳马今后的发展将是多度转体动作与多周空翻动作的较量,多度转体动作略有优势,各国运动员应根据各自特点选用不同类型的动作。  相似文献   

不同形式跳深练习发展弹跳力的实证研究     

王健 《体育科技文献通报》2015,(3):88-89,122

跳深作为一种超等长练习形式,可有效发展肌肉的收缩速度与收缩能力,提高肌肉力量与弹跳力。本文通过实验法、文献资料法、数理统计法分析得出,不同跳深高度、跳深形式练习的选择对发展肌肉弹跳力不同,向上跳还是向前跳,单腿还是双腿,应依据运动竞赛项目的发力工作方式而定。  相似文献   

平缝机非机械故障解疑     

李勇 《邢台职业技术学院学报》2008,25(3):67-68

平缝机是在服装加工生产过程中使用最广泛的服装加工设备之一,因为平缝机的的性能、使用的程度、使用者的习惯、熟练程度、加工材料等的不同,会出现各种各样不同故障,只有找出产生的原因,才能掌握平缝机各种故障的排除方法。  相似文献   

Concurrent criterion validity of a novel portable motion analysis system for assessing the landing error scoring system (LESS) test     

Gali Dar  Alon Yehiel  Maya Cale’ Benzoor 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(4):426-436

The landing error scoring system (LESS) assesses the quality of a landing after a jump. The quality of the jump is usually evaluated using a three-dimensional (3-D) motion analysis system or a two-dimensional (2-D) video analysis visually rated by a clinician. However, both methods have disadvantages. The aim of this study was to examine the concurrent validity of a novel portable motion analysis system (‘PhysiMax System’) in assessing the LESS score by comparing it to video analysis. The study population included 48 healthy participants (28.45 ± 5.61 years), each performing the LESS test while two video cameras and the ‘PhysiMax’ simultaneously recorded the jump. The ‘Physimax’ system automatically evaluated the LESS. Subsequently, the examiners scored the test by viewing the video recordings, blinded to the ‘PhysiMax’ results. The mean LESS score, using the video recordings and the ‘PhysiMax’ was 4.77 (±2.29) and 5.15 (±2.58), respectively, (ICC = 0.80, 95% confidence intervals 0.65–0.87), mean absolute differences 1.13 (95% confidence intervals; 0.79–1.46). The results indicate a high consensus between the methods of measurement. The ‘Physimax’ system’s main advantages are portability, objective evaluation and immediate availability of results. The system can be used by athletic trainers and physiotherapists in the clinic and in the field for jumping assessment.  相似文献   

跳深时下肢肌肉的表面积分肌电值及其平均功率频率值的变化特征研究   总被引：1，自引：0，他引：1  

郭建龙 《山东体育学院学报》2007,23(6):68-71

同步使用Kistler三维测力平台、TM-6710CL高速摄像机和16道便携式无线遥测表面肌电测系统,对从不同下落高度跳深的12名田径跳跃运动员进行了测试,测试结果表明:受试者跳深着地阶段缓冲期的积分肌电值大于蹬伸期值;正常状态下跳深时,下肢所测大多数肌肉的表面积分肌电值均比相对疲劳状态下的值大;较低下落高度跳深时,所测肌肉表面肌电平均功率频率值大于较高下落高度时的值;正常状态跳深时,下肢所测肌肉表面肌电的平均功率频率值大于相对疲劳状态跳深时的值。  相似文献   

跳跃类项目体能特征分析与训练     

田金生 《体育科技》2009,30(2)

跳跃类项目属于速度力量性项群,随着运动员技术的不断完善,其体能水平往往是决定比赛成败的关键因素。本文运用运动训练学原理,通过文献、比较及逻辑分析等方法,尝试结合跳跃类项目的特征,分析其体能的构成,探索跳跃类项目训练的内容与方法,为从事训练的运动员和教练员提供参考。  相似文献